 It also removes the assessment duties from the erstwhile used tightly-controlled NYC DOE process that uses pre-approved, independent child psychologists (who had, until 2007, administered the Stanford Binet), and gives most of the duties, instead, to a publishing company and laypeople.IQ in the top 5% is difficult to "accurately" measure.The GRS is too new to have been adequately normed for acceptable accuracy at those levels.